Prepared by high-efficient melt-treatment, the microstructure of high-property aluminium sheet used for easy-open cans during
hot-deformation was investigated and analyzed by isothermal compression test at elevated temperatures using dynamic hot simulation testing machine and by means of OM and TEM. The results showed that the effects of deformation temperature and strain rate on microstructure features of aluminium sheet were remarkable. Dynamic recovery occurred only at low deformation temperature, whereas
dynamic recrystallization occurred when deformation temperature was higher than 400℃, and the grains were equiaxed. At lower or higher strain rate, complete dynamic
Recrystallization occurred. However, the recrystallization mechanisms were different at lower and higher strain rate. When the strain rate was between (1.0)s~(-1) and 5.0s~(-1), only dynamic recovery occurred. The change of microstructure was not obvious at lower strain, but dynamic recrystallization occurred with the increase of strain. When the strain further increased, the recrystallized grains were elongated again.